assurance：保证，担保，确信，把握，信心

词根词缀：as-来,临近 + -sur-确信 + -ance

• oviform
• ovine
• oviparous
• oviposit
• ovoid
• ovoviviparous
• ovular
• ovulate
• ovulation
• ovule
• ovum
• owe
• owing
• owl
• owlet
• own
• owner
• ownership
• own goal
• owt
• ox
• oxbow
• Oxbridge
• Oxford
• oxidant